1.   All three extremes were related to a blocking high pressure system stalled over the upper Middle West this week.

2.   Blocking high pressure over Canada has diverted the active jet stream far south, setting the stage for a very damp Tampa.

3.   For much of the month, a blocking high pressure system over the Bering Sea has diverted low pressure systems south of the region, thereby suppressing snow.

4.   Rain and snow were spawned by a Pacific disturbance that slipped under a blocking high pressure system that was shielding the Pacific Northwest from storm systems.

5.   The slow chill in Rapid City came courtesy of a blocking high pressure system over northern Canada.

6.   This week, the Pacific jet stream was diverted south by a blocking high pressure system over western Canada.